I see. They're not Catholics, any more than Lutherans, Presbyterians, or Methodists are Catholics. They're denying the divinity of Jesus; that makes them Arians.
St. Athanasius, Pray for us.
The Paulist Center uses the Apostle's Creed rather than the Nicene Creed. There's little difference in its theology; it's simply shorter:
APOSTLE'S CREED:
I believe in God, the Father almighty,
creator of heaven and earth.
I believe in Jesus Christ, his only Son, our Lord.
He was conceived by the power of the Holy Spirit
and born of the Virgin Mary.
He suffered under Pontius Pilate,
was crucified, died, and was buried.
He descended to the dead.
On the third day he rose again.
He ascended into heaven,
and is seated at the right hand of the Father.
He will come to judge the living and the dead.
I believe in the Holy Spirit,
the holy catholic Church,
the communion of saints,
the forgiveness of sins,
the resurrection of the body,
and the life everlasting.
Amen